code: def test_get_node_from_page_data():
      data = (2).to_bytes(1, ENDIAN) + bytes(4096 - 1)
      tree_conf = TreeConf(4096, 7, 16, 16, IntSerializer())
      assert isinstance(
          Node.from_page_data(tree_conf, data, 4), RootNode
      )
  
file_path: bplustree/tests/test_node.py
imports: import pytest
  from bplustree.const import TreeConf, ENDIAN
  from bplustree.entry import Record, Reference, OpaqueData
  from bplustree.node import Node, LonelyRootNode, RootNode, InternalNode, LeafNode, FreelistNode, OverflowNode
  from bplustree.serializer import IntSerializer
label_desc: Use image node_id 7 for calling a global function with example usage: test_get_node_from_page_data() without return types